Thank you Capn Kirk but the thing is that the 300SD is in almost mint comndition as this guy babied it and had it taken care of insanely well. He is a friend of the family so I may also be able to get it for cheaper but in all the time I have been looking I have not seen any 240's around here at all.

But thank you for the answer about the op. temp. of the engine that will probably save some headaches in the future. But as for slowest car I can get, I dont think that will work out too well.